RLC Resonant Circuits to Read Out Transition Edge Sensors
ABSTRACT Superconducting Quantum Interference Devices (SQUIDs) offer, without any doubt, the best performance to read out Transition Edge Sensors (TESs). However, considerations about costs and low temperature power dissipation have pushed our group to investigate alternate schemes that could provide satisfactory, if not comparable, performance. In particular, we are investigating the performance of a low temperature resonant circuit coupled with a room temperature FET voltage amplifier. We report and discuss here our preliminary analysis of the performance and optimization of this scheme and a preliminary experimental proof of concept.
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ABSTRACT: A transition edge sensor series array (TES-SA) is an array of identical TESs that are connected in series by low-inductance superconducting wiring. The array elements are equally and well thermally coupled to the absorber and respond to changes in the absorber temperature in synchronization. The TES-SA total resistance increases compared to a single TES while the shape of the superconducting transition is preserved. We are developing a TES-SA with a large number, hundreds to thousands, of array elements with the goal of enabling the readout of a TES-based bolometer operated at 4.2 K with a semiconductor-based amplifier located at room temperature. The noise and dynamic performance of a TES-SA bolometer based on a niobium/aluminum bilayer is analyzed. It is shown that stable readout of the bolometer with a low-noise transimpedance amplifier is feasible.Superconductor Science and Technology 09/2010; 23(10):105019. DOI:10.1088/0953-2048/23/10/105019 · 2.80 Impact Factor